<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
    a {
        font-size: 16px;
        text-decoration: none;
        font-weight: 700;
    }
     /* 伪类标签 :link-未访问连接的状态、:valid-已访问链接状态、a:hover-鼠标移动到链接时的状态、:activ-鼠标选定的状态*/
     a:link { 
        color: #000;
     }
     a:valid {
         color: red;
     }
     a:hover {
         color:blueviolet   
     }
     a:active {
         color:chocolate
     }
    </style>
</head>
<body>
    <a href="#">访问链接</a>

</body>
</html>